>>>> The result of the bisection is>>>> [88dbcbb3a4847f5e6dfeae952d3105497700c128] blkdev: avoid migration stalls for blkdev pages>>>>>>>> Is that result relevant for the problem or should I continue bisecting between 4.20.0 and the so far first bad commit?>>>>>> Can you try reverting the commit and see if it makes the problem go away?>>>> Tried reverting it on top of 5.0.0-rc6-00153-g5ded5871030e and it seems>> to make the kernel work - emerge --sync succeeded.There is more to it.

After running 5.0.0-rc6-00153-g5ded5871030e-dirty (with the revert of that patch)successfully for Gentoo update, I upgraded the kernel to5.0.0-rc7-00011-gb5372fe5dc84-dirty (todays git + revert of this patch) and it broke on rsync again: